Huawei · PV inverters · Huawei SUN2000-KTL-M1 (three-phase inverter, 3–10 kW, battery-ready)
Alarm 4003The auxiliary power supply is faulty
Name in the manufacturer's documentation (fault list): The auxiliary power supply is faulty
[1]
In plain words (editorial)
The auxiliary power supply of the device is faulty.
When to call a service technician: Contact your vendor or Huawei technical support – the device needs replacing.
✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.
For technicians
Possible causes (source text)
- The auxiliary power supply of the device is abnormal.[2]
Steps given by the manufacturer (source text)
- Contact your vendor or technical support to replace the device.[3]
⚠ Work on refrigerant circuits, mains electricity and PV DC wiring is for qualified technicians only.
The Polish page has more detail (plain-language explanation, safe checks, guides): Read in Polish →
Sources
Every statement has a footnote to the document and PDF page. “Quote verified” means the quote was found automatically in the text of that page.
- [1] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 113 official manufacturer document quote verified
4003 The auxiliary power supply is faulty
- [2] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 113 official manufacturer document quote verified
the auxiliary power supply of the device is abnormal.
- [3] Inverter Alarm Reference (Issue 14, 2026-06-15) (EDOC1100345192 Issue 14) , p. 113 official manufacturer document quote verified
contact your vendor or technical support to replace the device.